A somewhat complicated weather situation took shape over Iowa during the day on the 27th.  A short wave lifted northeast across the state in the morning and produced a narrow line of thunderstorms.  These storms resulted in a boundary from west central into north central Iowa.  During the afternoon, a cold front approached Iowa from the northwest and reached the far northwest counties by late in the day.  Another short wave lifted northeast into the central U.S. during the late afternoon as well.  The airmass became very unstable by the late afternoon hours with temperatures warming into the upper 80s and 90s across the state.  Surface dew point readings were in the upper 60s to mid 70s.  Shortly before the storms developed, lifted indices were around -9 C. with CAPE values in the 4000 J/kg range.  The freezing level remained quite high and was at 14,800 feet with precipitable water values in the 1.5 to 2 inch range.  A line of thunderstorms formed from near Omaha northeast to west of Mason City.  The storms worked their way east-southeast.  A few became severe, however severe weather was quite limited.  The very moist airmass, in combination with the high freezing level, limited the hail to nickel size.  Winds became a problem during the later part of the event.  High winds tore the roof off of a house northwest of Jewell.  A wind gust of 70 MPH also occurred in Hardin County in the Iowa Falls area.  Winds were strong enough south of Alden in Hardin County to totally flatten crops in the area.  There were numerous reports of tree limb damage caused by 50 MPH winds, and spotty damage by 60 to 70 MPH winds.  During the late evening hours, thunderstorms refired behind the main line of storms.  A few of these storms became severe and produced three quarter to one inch diameter hail in Wayne, Clarke, and Cerro Gordo Counties. The storms also produced some locally heavy rainfall.  Rainfall around the Corydon area of Wayne County reached 5 inches.  This resulted in flash flooding as local creeks were running over rural roads south of Corydon.

Thunderstorm Wind in STORY, IOWA
From 27-JUN-05 17:10:00 to 27-JUN-05 17:10:00 (CST)
Location: AMES
Magnitude: 50 EG
Property damage: 3K
Reported by: EMERGENCY MANAGER

Thunderstorm Wind in HARDIN, IOWA
From 27-JUN-05 17:15:00 to 27-JUN-05 17:15:00 (CST)
Location: ACKLEY
Magnitude: 57 EG
Property damage: 5K
Reported by: TRAINED SPOTTER

Hail in HARDIN, IOWA
From 27-JUN-05 17:21:00 to 27-JUN-05 17:21:00 (CST)
Location: ACKLEY
Magnitude: 0.88 
Property damage: 1K
Crop damage: 5K
Reported by: TRAINED SPOTTER

Hail in WAYNE, IOWA
From 27-JUN-05 20:50:00 to 27-JUN-05 20:50:00 (CST)
Location: HUMESTON
Magnitude: 0.88 
Property damage: 2K
Crop damage: 5K
Reported by: TRAINED SPOTTER

Hail in WAYNE, IOWA
From 27-JUN-05 21:30:00 to 27-JUN-05 21:30:00 (CST)
Location: CORYDON
Magnitude: 1.00 
Property damage: 5K
Crop damage: 5K
Reported by: BROADCAST MEDIA

Hail in CERRO GORDO, IOWA
From 28-JUN-05 00:37:00 to 28-JUN-05 00:37:00 (CST)
Location: MASON CITY
Magnitude: 0.75 
Crop damage: 5K
Reported by: TRAINED SPOTTER

Hail in CLARKE, IOWA
From 27-JUN-05 22:25:00 to 27-JUN-05 22:25:00 (CST)
Location: WOODBURN
Magnitude: 0.88 
Property damage: 1K
Crop damage: 5K
Reported by: TRAINED SPOTTER

Flash Flood in WAYNE, IOWA
From 27-JUN-05 23:30:00 to 28-JUN-05 02:30:00 (CST)
Location: CORYDON
Property damage: 5K
Crop damage: 5K
Reported by: GENERAL PUBLIC

Hail in GREENE, IOWA
From 27-JUN-05 15:38:00 to 27-JUN-05 15:38:00 (CST)
Location: JEFFERSON
Magnitude: 0.88 
Property damage: 2K
Crop damage: 5K
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in HAMILTON, IOWA
From 27-JUN-05 15:58:00 to 27-JUN-05 15:58:00 (CST)
Location: JEWELL
Magnitude: 65 EG
Property damage: 25K
Crop damage: 1K
Reported by: BROADCAST MEDIA

Thunderstorm Wind in HARDIN, IOWA
From 27-JUN-05 16:25:00 to 27-JUN-05 16:25:00 (CST)
Location: IOWA FALLS
Magnitude: 61 EG
Property damage: 10K
Reported by: TRAINED SPOTTER

Hail in BOONE, IOWA
From 27-JUN-05 16:32:00 to 27-JUN-05 16:32:00 (CST)
Location: OGDEN
Magnitude: 0.88 
Property damage: 1K
Crop damage: 5K
Reported by: TRAINED SPOTTER

Hail in HARDIN, IOWA
From 27-JUN-05 16:33:00 to 27-JUN-05 16:33:00 (CST)
Location: IOWA FALLS
Magnitude: 0.88 
Property damage: 1K
Crop damage: 5K
Reported by: TRAINED SPOTTER

Hail in HARDIN, IOWA
From 27-JUN-05 16:50:00 to 27-JUN-05 16:50:00 (CST)
Location: ACKLEY
Magnitude: 0.88 
Property damage: 2K
Crop damage: 5K
Reported by: TRAINED SPOTTER

Thunderstorm Wind in HARDIN, IOWA
From 27-JUN-05 17:00:00 to 27-JUN-05 17:00:00 (CST)
Location: ALDEN
Magnitude: 65 EG
Property damage: 5K
Crop damage: 10K
Reported by: TRAINED SPOTTER

Hail in HARDIN, IOWA
From 27-JUN-05 17:00:00 to 27-JUN-05 17:00:00 (CST)
Location: ACKLEY
Magnitude: 0.88 
Property damage: 1K
Crop damage: 5K
Reported by: TRAINED SPOTTER

Thunderstorm Wind in STORY, IOWA
From 27-JUN-05 17:05:00 to 27-JUN-05 17:05:00 (CST)
Location: AMES
Magnitude: 51 MG
Property damage: 3K
Reported by: TRAINED SPOTTER